Lamp



H. J. GRAHAM June 14, 1932.

LAMP

Filed April 25, 1929 5 Sheets-Sheet l F'IG. L.

INVENTOR. HERBERT J. GRAHAM A TTORNE Y.

June 14, GRAHAM 1362572 LAMP Filed April 25, 1929 -5 Sheets-She t 2 v ATTORNEY.

June 14, 1932- H. J. GRAHAM 3 1 LAMP Filed April 25, 1929 5 Sheets-Sheet 3 HHHHHHI H\ Hil INVNTOR.

HERBERT J. GRAHAM BY C I l I A TTORNE Y.

H. J. GRAHAM June 14, 1932.

LAMP

Filed April 25, 1929 5 Sheets-Sheet 4 A TTORNEY.

LAMP 4 Filed April 25, 1929 5 Sheets-Sheet 5 INVENTOR. HERBERT .3. GRAHAM A TTORNE Y.

Patented June 14, 1932 STTS teeasn PATENT GWEC HEEBERT J. GBAHAM, OF PHILADELPHIA,

PENNSYLVANIA, ASSIGNOB TO ELECTR-IC TON OF PENN SYLVAN IA LAMP Application filed Aprl 25,

This invention relates to electric lamps and more particularly to electrically operated fiood lights, search lights, head lights and the like, which are intended for prejection of light over comparatively great distances or areas.

It is among the primary objects of this invention to provide in lights of the character to which the invention appertains means for adjusting or regulating the focal relation between the source of illumination and a reflector operatively associated therewith, said means being operable from a point located exteriorly of the lamp body or easing within which both the light source and the refiector are housed.

Auxiliary to the aforementioned object is the provision of a mechanism by means of which an electric lamp socket and the lamp received therein may be shifted radially of the lamp body or casing and along the vertical diametral line thereot, or adjnstcd such that the longitudinal aXis thereot makes a predetermined angle with the vertical, or moved laterally to either side of said vertical diametral line, the several adjustments being performed individually or conjointly to obtain that exact focal relation between the lamp and its refiector as may be desired.

Heretofore it has been a more or less serious problem to protect and preserve the refiecting surface of the refiector from the deleterious effects of the heat produced by lamps of high wattage. It is accordingly a still further object of the invention to provide means for increasing the rate of radiation of the heat generated in the lamp body or casing to thereby obtain a lowered temperature therewithin, in consequence of which the life and eflectiveness of the reflecting medium of the refiector is considerably increased. In the attainment of this object, the lamp body or easing is provided with a radially projecting enclosure for the lamp soclet and the focusing meehanism hereinbefore referred to, said enclosure being provided in its external surface with a plurality of radially extending annular fins which serve as means 'tor quickly carrying away from the interier of the lamp body the heat 1929. Serial No. 351906.

which may be generated in the base or neck of the incandescent light bulb.

Other objects of the invention will appear nore fully hereinafter. i

The invention consists substantially in the combmation, Construction, location and relative arrangement of parts, all as will appear more fully hereinafter, as shown in the accompanying drawings and as finally pointed out in the appended claims.

In the accompanying drawings, which illustrate preferred embodments of the presont invention:

Figure l is a vertical sectional view through the top portion of a light einbodying the features of this invention, said view being taken on the line 1-1 of F igure 3;

Figure 2 is a similar view but at right angles to that of Figure l, this view being taken On the line 2-2 of Figure 3;

Figure 3 is a top plan view ot' the focusing mechanism with the cover therefor removed;

Fgure 4 is a vertical section taken on the line l-t of Figure 1;

Figure 5 is a vertical sectional View showing a modified form of 'focusing mechanism constructed in acoordance with the present invention as embodied in the bottom oi' a light; and

Figure 6 is a vertical sectional view taken at right angles to that shown in Figure 5.

Referring now to the drawings and more particularly to Figures l and 2, it will be observed that the invention has been embodied in a flood light or the like having a substantially drum-shaped lamp body 10 upon the rear wall ll of which is suitably positioned a refiector 12. 'I he 'rontal opening ot 'the lamp body is closed by a front door closure (not shown) to provide a normally sealed housing for the refiector and the source of light 13.

Projecting radially upwardly from the annular wall 14 of the lainp body 10 and communicating with the interier of said body through an opening 15 provided in said wall is a substantially cylindrical body 16 having an aperture 17 in one side thei-cof. The bottom edge of the cylindrical body 16 fits shugly within and is permanently secured to the peripheral edge of the opening 15, preferably by means of an annular welded joint 18. Integrally toi-med on the internal surface of the cylindrical body 16 and below the upper edge thereoi is an annular flange 19, circum- 'ferentially spaced portions of which project inwardly and in the plane of said flange to provide a series of shelves 20, 21 and 22. As appears most clearly in Figur-e 3, the shelves 21 and 22 are diametrically opposed to the shelf and are spaced laterally apart to pro de a substantially T-shaped slot or opening` 23 in the top of the cylindrical body 16.

Superposed upon the fiange 19 and secured thercto, preferably by rivets 24-, is a plate member 25 of a form corresponding to that of said fiange 19, this plate member 25 being also provided with a central T-shaped opening' adapted for registry with that which is defined by the inner marginal edges of the flange 19. Integrally formed in that portion of the plate member 25 which overlies the sheli 20 is au upwardly projecting and inwardly inclined boss 26, both the boss 26 and the shelf 20 being commonly provided with a continuous nternally threaded bore 27. Integrally formed in each of those portions of the plate member 25 which overlie the shelves 21 and 22 of the flange 19 is an upstanding oui-nal member 28, the two journal members so provided being spaced laterally sport and disposed in parallel relation. The journal members 23 are respectively provided in the upper portions thereoit' with horizontally alined apertures 29 through which is projected a threaded hearing screw 30. This screw is provided at one end with a ker'ed Operating head 31 and at its opposite end with an annular shoulder 32, said head and shoulder serving to prevent longitudinal displacement of the screw but permitting rotation thereot between the ournal members 23.

Extending transversely across the head of the T-shaped opening provided in the superimposed fiange 19 and plate member 25 is a member 33, one end of which terminates between the journal members 28 and is provided with a horizontally extending internally threaded bore 34 for threaded engagement with the hearing screw such that the latter aior( s a pivotal support for the member 33. The tree end of this member 33, which is arranged to terminate just above the inner edge of the inclined boss 26, is of substantially cylindrical cross-section and is provided with opposed lateral extensions 35 continuous therev-:ith and of the same section. Extending vertieally through the central portion of the member 33 is an internally threaded bore 36 within which is threadedly received a screw 37, the function of which will be explained in greater detail hereinafter.

Operatively associated with the free end of the member 33 is the adjusting nut 38, the latter being` best shown in Figure 1. This nut 38 is provided with a suitably kerfed head 39 and a threaded shank 40 arranged to be threadedly received within the inclined bore 27 formed in the boss 26. As appears most clearly in Figure l, the head 39 of the adjusting stud is provided with an annular groove or recess 4:1 within which is snugly received the free end of the member 33. By virtue of the fact that said *free end is in the form of a laterally extending flange of cylindrical cross-section, there is provided an -articulation between the member 33 and the adjusting stud 38 of a character which permits the 'orner to be shifted laterally with respect to the latter without the joint being broken.

From the toregoing description of the several parts of this nvention so far mentioned it will be apparent that by rotation of the hearing screw 30 in one direction or another the member may be shifted bodily in direction parai'leling the longitudinal aXis of the hearing screw, this movement of the member being permitted without disruption ot' the articulated connection between the member 33 and the adjusting stud 38. The ext nt of this lateral movement of the member 33 limited by the journal members 28. On the other hand, angular adjustment of the member 33 about the hearing screw 30 is obtained by rotation of the adjusting stud 38 in one direction or another. Thus, upon rotation of the stud in counter-clockwise direction the free end or" the member 33 will be lifted upwardly while rotation thereof in clockwise direction will cause said end to be depressed. lVhile in Figures 1 and 2 the central screw 37 (that which is carried by the member is shown with its axis extending vertically and disposed in a plane passing through the axis of the adjusting stud 38 and normal to the bea 'ing screw 30, by virtue of the two adjustments just described the central screw 37 may be shifted to either side of said plane at the same time that it may be inclined with respect to the vertical.

As best agpears in Figures 2 and 3, it will be observed that the member 33 is provided intermediate the ends thereof with a crosshead con'prising* a pair of oppositely extending projections 12- 12 each of which is provided with an opening 43. These openings -13 are arranged to either side of the central internaliy threaded bore 36, the axes of said openings and said bore being disposed in a common plane. As has already been pointed out, a screw 37 is threadedly received within the central bore 36, the upper end of this screw being kerfed, as at 44, while the lower end is provided with an annular shoulder 45. Respectively arranged for vertical movement through the laterally disposed openings 43 of the member 33 are a pair of upper edge of the cylindrical body 16.

guide studs or stems 46, the upper ends of which are provided With pins or other suitable means 47 for limiting the downward movement of said studs within their respective openings 43.

The lamp socket 47' is supported from the member 33' through the intervention of a pair of superposed strap members 48-49 between which the shoulder at the bottom end of the central screw 37 is received, it being observed thatthis screw passes upwardly and freely through an opening 50 provided in the upper &trap member 48 to thereby permit rotation of said screw independently of said sti-ap members. Opposite ends of the strap members 48-49 are commonly apertured, as at 51, for respectively receiving the reduced lower ends of the guide studs 46, which latter are in turn suitably secured to the socket 47' by screws 52. By virtue of the arrangement just described for supporting the lamp socket, it will be readily seen that while said socket is axially movable toward and away from the member 33 it is precluded from rotating reiatively with respect to said member, the said axial ustment being effected by rotating the screw 37 in one direction or another.

From the fcregoing it will be observed that a substantially universal adjustment may be had of the incandescent bulb 13 which is carried by the SOClG 47', the latter being Shiftable laterally in a direction paralleling the bear-ing screw' 30, or adjustable angularly about the axis of said hearing screw, or movable toward or away from the member 33. Obvously, these adjustments, which are respectively effected by the lateral adjusting screw 30, the adjusting stud 38 or the central adjust-ing screw 37, may be performed individually or conjointly to obtain the exact tocal relation between the light source 13 and the refiector 12 as may be desred. Inasmucl as each adjustment is obtained through the action of a screw no additional or auxiliary locking means need be employed for maintaining the bulb in the adjusted position. Furthernore, in each instance the adjustment may be readily efi ected by means of one tool, such as a screw driver, which is engaged in the slot commonly provided in the head of each adjusting element.

The focusing mechanism as just described is protected from the weather by a dome-like cap or cover 53 which fits over the upper edge oi the cylindrical body 16 within which the mechanism is housed. An annular gasket 54 suitably retained in position immediately within the peripheral edge of the cap 53 serves a hermetic seal between said cap and the The cap 53 is retained in position and against displacement by a bail 55, prefcrably of spring wire, the trunnions 56 of which are pivotally received within diametrically opposed socketed bosses 57 which project radially from the cylindrical body 16. An offset portion 58 in the transverse portion of the bail y-eldingly engages a central depression 59 in the cap 53, the p ressure of this bail upon the cep being suticient to compress the gasket 54 so as to form a fluid tight seal between the cap and its support. The cap may be loosely connected to the body 16 by means ot' a fiexible cha in 60 for preventing its accident-al loss or misplacement.

In light projectors of the type shown in Figures 1 and: 2, the incandescent bulb used is ot' such Capacity as usually necessitates some` means for carrying the generated heat away from the interier or"- the lamp body. Generaily this has been accomplished by ventilating the lamp body at the risk of leakage or entrance of dust, moisture and the like into the interior thereof. To prevent this entrance of deleterious elements and yet provide for an ample radiation of heat the cylindrical body 16 enclosing the soclet 47' is provided on its external surface with a plurality of annular heat radiating fins 61. Inasmuch as-by far the greatest amount of heat is concentrated in the immediate vicinity of the neck and base of the incandescent bulb these fins 61, which thus embrace the vicinity ot greatest heat concentration, serve, as eficient means for quickly conducting the generated heat away from the interier' of the lamp body. As clearly appears in Figure 1, the cylindrical body 16 is provided with a condulet type terminal 62 through which suitable conducting wires (not shown) are connected to the lamp soclet 47. The wires leading from said soclet pass through the opening 17 in the side of the body 16 for connection to a suitable terminal block (not shown) within the terminal 62.

Figures 5 and 6 show a somewhat modilied arrangement of focusi ng mechanism as employed at the bottom instead of at the top of the lamp body or casing 10. As in the former instance this lamp body encloses a refiector 12 and a source of light 63, it bei-ng: observed that the latter is provided with a much shorter base than is the bulb shown in Figure 1. Provided in the bottom of the annular wall 14 of the lamp body 10- is an opening 64 over which is directly secured a plate member 65 the latter being substantially similar to the plate member 25 heretofore described in connection with Figures 1 to 4. The plate member 65 is integrally secured to the peripheral edge of the opening 64, preferahly by an annul-ar welded joint 66. Operatively associated with the plate 65 are the member 67, the lateral adjust-ing screw 68, and the adjusting stud 69-. all of which are substantially identical to the corresponding parts of the top focusing arrangement already described. The mechanism for adjusting the bulb 63 toward or away from the member 67 i. e., radially of the center of the lamp body, differs somewhat from the corresponding mechanism of Figures 1 to 4.

As appears quite clearly in Figures 5 and G the member 67 has threadedly Secured thereto a hollow sleeve 70, the free end of which is threaded, as at 71, to receive a cross-head 72. The opposite ends of this cross-head 7 2 are apertured, as at 7 3, to slidably receive guide studs or stems 74, which latter are secured, by means of screws and through the intervention of the superposed strap members 76 77,'t0 the base of the lamp socket 78. Pins 79 respectively provided in the lower ends of the guide studs 7 4 limit the inward movement thereof through the cross-head 7 2.

The hollow sleeve 70 is internally threaded, as at 80, throughout the upper portion thereof for threadedly receiving an Operating stem 81, the lower end of which projects free of said slceve and is provided with a lnurled Operating knob 82. The unthreaded portion of the stem 81 is of reduced diameter and 'forms with the threaded portion thereof a shoulder 83 which coacts with the internal shoulder 84 of the sleeve 70 to limit the outward movement of the stem 81. The upper or inner end of the Operating stem is provided with a head 85 received between the strap members 7 6-77 the arrangement being such as to permit rotation of the operating stem independently of the cross-head 7 2 and accordingly the lamp socket 7 8. As in the case of the upper focusing mechanism the bottom mechanism is als'o enclosed by a removable deme-like cap 86 which is retained in place by a` spring wire bail 87.

It will be observed that in the modified arrangement, as shown in Figures 5 and 6, the Operating screw is of considerably greater length than the corresponding screw of Figures 1 and 2, thus making it possible to position a bulb of smaller Capacity or diierent type centrally of the refiector without radically changing the focusing mechanism as a whole and without necessitating access to the interier of the lamp casing to efiect the proper fecal adjustment of the light source relative to its reflector. In each of the descrbed arrangements the number of possible adjustments for insuring proper focal relation and the character thereof are the same, as is the manner of eiiecting such adjustments; It will'be understood, of course, that various changes may be made from time to time without departing from the general spirit or principles of the invention, as indicated by the appended claims.

lVhat is claimed as new and useful is:

1. In a light projecting device, in combination, a hollow casing having an opening therein, an apertured plate positioned over said opening, an axially immovable hearing screw journalled upon one side of said plate, a member extending across said plate aperture having one end thereof pivotally mounted upon said screw, the free end of said member being provided with an elongated extension paralleling said screw, said screw being adapted for rotation whereby to shift said member in the direction of its pivotal aXis, an axially movable stud received in said plate and slidably engaging the elongated extension of said member to adjust the latter angularly about said azis, and a lamp-supporting screw movable axially through said member and projecting interiorly of said casing through said opening.

2'. In a light projecting device, in combination, a hollow casing having an opening communicating with the interier thereof, a lateral screw arranged at one edge of said opening, an axially adjustable stud mounted at the opposite edge of said opening, said stud being capable solely of an az ial movement, a member having one end journalled upon said screw with the opposite end thereof engaging said stud, cooperating means in said stud and member for permitting the latter to be shifted in a direction paralleling said screw without eii'ecting its disengagement from said stud, and an axially adjustable lamp-supporting stem earried by said member and projecting interiorly of said casing through said opening and along a line disposcd between said lateral screw and said stud.

3. In a light projecting device, a focusing mechanism including a rotatably mounted bearing sc ew, a member pivotally secured at one end to said screw with capacity for movement in the direction of its pivotal axis upon rotation of said screw, an ar ially movable stud capable only of rectilinear movement operatively associated with the free end oi" said member, means a'fording an articulated connection between the free end of said member and said stud for precluding disengagement of said member from said stud upon movement of the former in the aforesaid direction, said stud being` operative to adjust said member angularly about said pivotal axis, and lamp supporting means arranged for axial movement through said member.

4. In a light projecting device, in combination, a hollow casing having an opening therein, an apertured plate positioned over said opening, a hearing screw journalled upon one side of said plate, a member extending across said plate aperture having one end thereof pivotally mounted upon said screw, said screw being adapted for rotation 'whereby to shift said member in the direction of its pivotal axis, a headed stud threadedly received in said plate, the head of said stud being provided with an angular ;rroove within which is tangentially received the opposite end of said member, and a lamp socket supported by said member.

5. In a light projecting device, a 'focusing mechanism including a rotatably mounted hearing screw, a member pivotally Secured at one end to said screw with Capacity for movement in the direction of its pvotal aXis upon rotation of said screw, an axially movable stud having a groove and tongue connection with the free end of said member, means for precluding disengagement of said member from seid stud upon movement of the former in the aforesad direction, said stud being operative to adjust said member angularly about said pivotal aXis, and a lamp socket carried by said member.

6. In a light projecting device, in combination, a focusing mechanism including a rotatably mounted bearing screw, a member arranged with said screw projecting through one end thereof, the opposite end of said member being provided with an elongated extension paralleling said screw, aXially adjustable means having an annular groove within which said extension is tangentially received, and a lamp socket carried by said member, said axially movable means being operative to eiect angular displacement of said member relatively to said screw and said screw being operative to eiect a tangential movement of said member relatively to said aXiallv adjustable means.

7. In a light projecting device, a focusing mechanism including a member arranged for angular adjustment about a fixed aXis, said member being provided at one end thereof with a pair of opposed lateral extensions to provide conjointly with said end of the member a transversely extending head, and a rectilinearly adjustable element intersecting the plane of said member for eiiecting said angular adjustment thereof, said 'element having a groove within which said head is adapted to be received for transverse movement in a direction paralleling said aXis.

8. In a light projecting device, in combination, e focusing meohanism including' a member arranged for angular adjustment about a fixed axis, a stud capable solely of a rectilinear movement in the direction of its aXis for efiecting said angular adjustment of said member, means for aXially adjusting said member along said fixed aXis, an articulated connection between the free end of said member and said stud including interengaging tongue and groove elements for efl'ectually precluding disengagement of said member from said stud during the angular and aXial ndjustments of said member, and a lamp socket carried bv said member.

In testimony whereof, I have hereunto affixed my signature.

HERBERT J. GRAHAM. 

